Machine tool



4 sheets-sheet 1 LE ISLE D. kNCBLE E T AL MACHINE TOOL Filed Nov. 6,1943 March 12, 1946.

March 12, 1946. E .Q E D', NOBLE ETL ,2,396,281

MACHINE TOOL Filed Nov. 6, 1943 4 4 Sheets-Sheet 2 Arme/vers March12,1946. LE ISLE D. NoBLEjE-*r Al. 2,396,281

MACHINE TooL Filed Nov, 6, 194s 4 sheets-sheet s l Arwen/sys March 1.2,1946. LEISLE D. NOBLE ETAL 2,396,281

Filed Nov. 6, 1943 4 Sheets-Sheet 4 WMU' . j ulink l Ande/Veys PatentedMar. l2, 1946 UNITED STATES PATENT OFFICE MACHINE TOOL Le VIsle D.Noble, Maple Heights, Arthur H. Stanton, Jr., Shaker Heights, and JohnG.

Jergens, Warrensville Heights, Ohio;

said

6 Claims.

The invention relates to improvements in machine tools, and isparticularly illustrated in the accompanying drawings and describedinthe following description as embodied in a radius grinding machine.

The objects of the invention are to provide a machine of the characterdescribed which may be readily and easily assembled from its componentparts, which shall have a wide range of adjustments, and which may beeasily and effectively manipulated to produce a closely accurateoperation on the work. Y

In the application of the principle of the `invention to a radiusgrinding machine, the entire table supporting the work is oscillatedupon a central vertical pivot to pass the work mounted on a horizontalaxis in a horizontal arc against the eiective surface of the grindingtool which is mounted upon a vertical axis, the grinding surface of thegrinding tool being spaced from the oscillatory axis of the work table,during the grinding operation, a distance equal to the radius of the arcbeing formed on the work.

The annexed drawings and the following description set forth in detailcertain means illustrating the improved machine tool, `such meansconstituting, however, only one of the various forms in which theprinciple of the invention may be embodied.

In said annexed drawings:

Figure 1 is a side elevation of a radius grinding machine in which theimprovements of the invention are embodied, the view being partially incentral longitudinal Vertical section;

Figure 2 is a side elevation, partially in vertical axial section, andupon an enlarged scale, of certain elements constituting a feed controlmechanism shown at the left-hand end of Figure l;

Figure 3 is a front elevation, partially in transverse section, takenfrom the left-hand end of Figure 1;- Y

Figure 4 is a plan section, taken from the planes indicated by the line4 4, Figure 1;

Figure 5 is a fragmentary plan section, taken from the planes indicatedby the line 5 5, Figure 1;

Figure 6 is a partial side elevation, upon an enlarged scale,particularly showing the relative positions of the work and the grindingwheel detached from the machine, the relative position of a certainwork-tooth supporting blade being also indicated; and Y Y Figure '7 is apartial plan section, taken from the planes indicated by the line 1 1,Figure 6.

Referring to the annexed drawings in which the same parts are indicatedby the same several numbers in the respective views, the main parts ofthe improved radius grinding machine consist of a base I, a work tablesupport casting l0 longitudinally and transversely adjustable of thebase I, and bolted in adjusted position thereon, a table 25 mounted tooscillate in a horizontal plane around the axis A of a main pivot pin 50upwardly extended into the table 25 from the casting l), the table 25having an upper sliding surface, a slide I5 having a lower slide surfacewhereby it can be longitudinally adjusted relatively to the table 25 andan upper slide surface upon which mai7 be transversely adjusted an upperslide da forming a base for Work standards I2, the latter and the slide40 also being formed with sliding surfaces whereby the standards I2 canbe transversely adjusted on the upper slide IIB, the work 'I shown as amilling cutter being centrally mounted on a horizontal axis in the workstandards I2. Other important parts of the improved radius grindingmachine include a motor 5 for driving the grinding wheel 35, a tubularmotor postl 8 mounted in the base I, a cutter tooth blade support 88longitudinally adjustably mounted on the upper slide 40 and alsoadjustable in an arc about a vertical axis, and a screw engaging theslide I5 and serving for longitudinal feeding of the latter and allparts thereabove relatively to the grinding wheel 35. v

As stated, the table 25 and the parts supported thereby oscillate in ahorizontal plane around the vertical axis A of the main pivot pin 58 andthe abrading surface of the grinding wheel 35 and the cutting edge ofthe tooth of the milling cutter I being ground thereby, aresubstantially parallel to and spaced from the axis A of this main pivotpin 5l] during the grinding operation, the spacing distance being equalto the radius r of the curve 'i2 being formed on the cutter 1, asclearly indicated in Figures 6 and 7, this position being perfect,within working conditions, at the termination of the grinding operaltion.

Referring now to the detail of the main parts hereinbefore mentioned andthe method of their assembly, and their relative adjustments, the base Iis formed with corner bolt holes 2 whereby it may be securely fastenedto any permanent foundation. The casting Iil is formed with end ears IIhaving open-ended slots I6 which accommodate T-head bolts Il, wherebythe casting I0 can be releasably secured to the base I. The base I isformed inits upper surface with a central transverse T-groove 3 and acentral longitudinal T-head groove 4. Seated in the casting I5intermediate the respective ends of the latter and the transverse groove3 are two pairs of depending bolts 22 Whose lower enlarged head portionsare embedded in a pair of blocks 35 adapted to slide in the narrowportion of the T-grocve 3 or the T-groove 4 depending upon the angularposition in which the casting lo is mounted upon the base I, the ears IIbeing so located that the lower enlarged heads of the bolts I'l slide inthe wide portion of the grooves 3 .and ll. The upper ends of the blocks34 are laterally xed by radial grooves 36 formed in the bottom surfaceof the casting I in which the blocks 35 are seated. Therefore, thecasting Il) can be both longitudinally and transversely adjusted on thebase I by a sliding of the blocks 34 in the grooves 3 and il, thecasting I 0 being turned 90, if necessary, for the engagement of theblocks 35 with the particular groove 3 or 4 desired.

' The base I is also formed on the longitudinal center line with a lowertubular boss E1 at the rear, which receives a reduced bottom end portionS1 of a pin 9 extended upwardly into the bottom end of the verticaltubular motor post 8 which is mounted on the boss I1 and has a shoulder81 against which the upper end of the pin 5 abuts, the upper end of thetubular post 8 accommodating a depending pin portion 51 of a cap 5mounted on the top of the motor po-st 8, the depending pin portion 61abutting a shoulder 82 of the motor post 3 and being rotatably Xed inthe motor post 8 by a pin 3l.

One side of the cap 6 is formed with a vertical hole 62 therethroughthrough which is passed a vertical screw 65 formed with a shoulder orflange 58 which engages the lower face of the cap 5 in the desiredadjusted position of the screw G5, the screw 65 above the cap 5 passingthrough a collar 61 secured thereto by a pin 55. The upper end of thescrew 65 extending above the top face of the collar 6l is formed with asquared portion to facilitate turning of the screw 55. The threadedportion of the screw 55 is passed through a threaded hole formed in oneside of a motor support 56 split at its opposite side whereby by bolts59 it may be clamped to and released from the tubular motor post 8 whichit surrounds, the opposite side 561 of the clamp 55 which is adjacentthe screw 65 having a plane surface which is fastened by bolts 591 tothe base 2d of the motor 5. Inasmuch as the grinding wheel 35 is securedto the shaft of the motor 5, it is evident that the grinding wheel 35can be adjusted as to height, by an adjustment of the motor 5 and splitmotor support 56 relative to the motor post 8.

The table 25 which is rotatably guided on the main pivot pin 50 islocked to the underlying casting I0 by a plate 55 which is secured tothe bottom face of the pivot pin 50 by screws 58 and abuts the top wallof a recess 5l formed in the bottom face of the casting lil, an upperflange 54 of the pivot pin 50 being disposed in a recess 59- formed inthe top surface of the table 25. The table 25 is formed in its bottomface with an annular ball race 25 and the top face of the casting I0 isformed with a complementaryy ball race 20, which races 20 and 25accommodate balls 2l whereby the table 25 is oscillatory in a horizontalplane on the casting I!) around the pin 50 as a pivot. The upper part ofthe casting Ill is formed with a peripheral shoulder Il ex- 2,396,281 y.i ,c y

teriorly of the ball race 20 which ts within a shoulder 251 formed onthe bottom face of the work table 25.

The top of the table 25 is formed to serve as a slide for thelongitudinal adjustment of the slide I5 and all parts thereabove.. Thisis effected by providing longitudinal upwardly-extended side portions 35of the table 25 with opposed inner beveled slide surfaces 38 cooperatingwith lower outer beveled slide surfaces 39 formed on a depending portionI51 of the slide I5, a gib 5I being provided adjacent one of the slidesurfaces 38 and adjusted thereagainst by screws 53 mounted in a sideportion 30 of the table 25. Secured by depending screws 44 to the sidesof the upper` slide 40 are blocks 42 which are tapped to accommodatethumb screws 49 whose inner ends engage the side surfaces of the slideI5 whereby the latter can be transversely adjusted and locked in itsadjusted position.

The longitudinal adjustment of the slide l5 is effected by the feedscrew 6l) actuated by a ball handle QI `keyed to the outer end thereof,the inner end threaded portion 602 of the screw 55 engaging alongitudinal elongated tapped hole l52 formed in a bushing I53 seated inan opening in the slide I5 and formed with an enlarged from end portionI 54 secured ush against the front face of the slide I5 by a screw 63.

An intermediate portion of the screw 60 passes through a boss SI1 formedin an upwardly-extended front arm 3| of the table 25 and is adapted tobe rotatably secured therein by a thumb screw 14. The screw 55 is formedwith a flange 9i) which engages the rear surface of the boss SI1 andbetween the ball handle SI and the forward face of the boss 3I1 ismounted a graduated dial SI rotatable upon a plug lil having a rear ange'II mounted in a collar 84 disposed between the front face of the bossSI1 and the rear face of the dial 8|. Secured to and rearwardly-extendedfrom the collar 84 is an alignment pin 56 which is passed through thecollar 84 and into an elongatedlongitudinal hole 55 formed in the arm3l, thus rotatably fixing the collar 84 with reference to the table 25.An arrow is impressed in the collar 8f! which serves as a reference markfor the graduations on the dial 8l. The dial 8l is secured at the frontby a knurled nut 83 engaging a front end threaded portion of the plugl0. The ball handle SI is keyed to the screw 5E! and is mounted betweenthe threaded portion of the plug lil and a washer 92 surrounding thescrew 6U by a nut 93 also engaging a threaded portion of the screw 65.It is evident that a loosening of the thumb screw 'l5 will permitlongitudinal feeding by means of the screw 59 of the slide I5 and allparts thereabove relative to ther table 25.

The upper slide 4) and the parts thereabove are transversely adjustablerelatively to the underlying slide I5 and the parts therebelow. Thisadjustment is effected by beveled outer surface front and rear slideways46 formed upon a downwardly-extended portion 45 of the upper slide illwhich cooperate with inner surface opposed slideways 4I formed upon theslide I5, a gib 52 being interposed between one pair of slideways 56 and4I and adapted to be adjusted against the slideway 45 by screws 41threaded in the slide I5.

The laterally-opposed work-supporting standards I2 are secured to theupper slide 40 by T-bolts 54 which have depending enlarged headsengaging the lower enlarged portion of a transverse T-slot 'I6Y formedadjacent the top of the ases-,eer

upper slide 40. Thus the work standards I2 can be adjusted transverselyof the upper slide 40 and all parts therebelow. Theseq standards I2 areof angular formation and it is through bottom hori'ontal portions I9thereof that the bolts 54 are passed, the upper vertical portions 23 ofthe standards l2 being spaced and o-pposed and providing an area withinwhich the work 1 may be rotatably mounted. This mounting is effected onan intermediate journal portion 43 of a pin 32 one end lill of which isreleased seated in one of the members 23 by a set screw |02, a flangedportion $1 of the pin 32 being interposed between said member 23 and thejournal portion 43 upon which the work 1 freely turns, an oppositereduced end portion I() of the pin 32 being seated in a plug 98 mountedin the opposite member 23, said plug 98 having an inner end flange 99mounted between said last-mentioned member 23 and the adjacent face ofthe intermediate journal portion A3. It is evident that both standardsI2 as a whole may be adjusted transverselir of the machine and that thetwo Vstandards I2 may be relatively laterally spaced to accommodate thethickness of the hub 11 of the work 1 mounted on the journal portion 43of the pin 32.

The work 'i herein shown is a milling cutter, and the teeth I3 thereofare supported by the blade support 83 mounted on the upper slide A0.This mounting is eiected on a rearwardly-extended upper portion 11 ofthe upper slide 40 by means of an angular post 15 longitudinallyadjustably mounted in any desired one of several parallel transverselyspaced T-slots 18 formed in the top face of the upper slide llIJ andadapted to receive in bottom enlarged portions thereof the lowerenlarged heads of abolt 85 passed through' the post 15, anupwardly-extended portion 80 of the post 15 having a verticalcylindrical recess 19 within which is adjustably mounted by screw 94 anlupwardly-extended post 81 in the upper end of which in turn is mountedthe blade support 88. The bottom base portion of the angular post 15which receives the bolt 85 can be disposed at an angle to the axes ofthe slots 13 so that by swinging the same on the axis of the bolt 85considerable latitude is given to the position oi the blade support 83,even in one position of the bolt 85. Therefore, this swinging adjustmentand the multiplicity of slots 18, together with the longitudinaladjustment therein of the angular post 15, permits adjustment of theblade support 8B to a great number of positions.

A lubricating tting 21 is mounted in the table 25 to service the ballraces 20 and 20, and a lubricating tting 33 is mounted in the boss SI1to lubricate the bearing for the screw 60 in the boss 3I1.

Referring particularly to Figures 6 and '7, attention is directed to thefact that the oscillatory axis A of the table 25 is vertical and isspaced a distance equal to the radius 1 from that portion of theperiphery of the grinding wheel 35 which is in grinding engagement witha tooth I8 on the work 1. This oscillatory axis A is also substantiallyparallel with the outermost surface portion of the tooth after it isground and while it is in the grinding position shown in Figure 6. Theradius grind is effected by the oscillating of the table 25 about thepivot pin 50 which swings the work 1, 90 in the direction indicated bythe arrow 95, to the position shown in dot and dash lines at 12 inFigure 7, to produce the arc 12 ground on one side of the tooth. Thecenter 121 of the desired curve 12 is longitudinally aligned with andforwardly spaced from the axis A at the beginning of the operation.

The extent land amplitude of the oscillation of the table 25 which, asmentioned, is 90 for the operation described herein, is determined bycertain adjustable stops which are provided for this purpose. Thesestops are shown in Figures 3, 4, and 5 as set for eecting the radiusgrind l2 shown in Figure 6 and are comprised of the following elements:formed with a nose portion 23 which to determine the oscillatory swingof the table 25 engages blocks I3 secured to the casting I0 by spacedbolts Ill mounted in an arcuate T-slot 29 formed in the casting I0.

Successive grinding operations 12 are effected upon one side of each ofthe teeth I3 successively, by manually indexing the work, one tooth at atime, against the support 83 while the plane of the work 1 is parallelto the adjacent periphery of the grinding wheel, and oscillating thework 1 through its angle of 90.

Thereupon the work 1 is progressively fed toward the grinding wheel andeach tooth I8 is successively ground until the center 121 is coincidentwith the axis A in which position the grind 12, having the desiredradius r, will be produced on the tooth.

Then, if desired, radius grinds 13 may be effected successively upon theopposite sides of the teeth I8, as suggested in dot and dash lines inFigure 7. In order to produce such grinds 13 on the opposite side of thework teeth I8 it is necessary to retractl the work from the periphery ofthe grinding wheel 35 by turning the screw 60 in a suitable directionand it is further necessary to shift the work laterally 'by a suitablemanipulation of the screws 49 until the center 131 of the desired curve13 is longitudinally aligned with and forwardly spaced from the axis A.The work 'I is then oscillated in a 90 arc in the direction indicated bythe arrow 96, Figure 7. The work 1 is then manually indexed, one toothIS at a time, against; the support 88, while the plane of the work isparallel to the adjacent periphery of the grinding wheel and, after eachindexing, the work is oscillated through its angle of This indexing andoscillating operation is repeated until each tooth I8 has been ground atleast once by the wheel 35. Thereupon the Work I is progressively fedtoward the grinding wheel and each tooth I8 is successively ground untilthe center 13l is coincident with the axis A in which position the grind13 having the desired radius r will be produced on the tooth.

The production of the grind 13 necessitates the `re-setting of therespective blocks I3 in the T-slot 29 to positions on the opposite sidesof the machine from the positions occupied by these blocks I3 when thegrind 12 was produced, as will be understood.

What we claim is:

l. A radius grinding machine comprising. a base, a work-table mountedthereon for turning movement in a horizontal plane, a slide adjustableon the table in one direction and a second slide adjustable on themst-mentioned slide in a relatively right ang-ular direction,feed-control mechanism for adjusting the first-mentioned slide in saidone direction, a work-standard erected on the second slide andadjustable thereon, means for mounting work on a horizontal axis in theWork-standard, a motor vertically adjustably mounted on the base, and agrinding wheel supported by and rotatable by the motor and The rear endof the table 25 ismounted to turn on a vertical axis with its peripheralgrinding surface spaced a horizontal distance from vertical alignmentwith the turning axis of the work-table equal to the radius of thedesigned operation upon the Work.

2. A radius grinding machine comprising a base, a, work-table adjustablymounted thereon and also mounted for turning movement on an axisangularly related to the plane of adjustment, a

slide adjustable on the table in one direction and a cross Slideadjustable on the first-mentioned slide, feed-control mechanism for therst-mentioned slide, a. Work-standard mounted on the second slide andcomprising two spaced laterallyopposed relatively adjustable members,the second slide being formed with T-slots, and T-bolts depending fromsaid members and engaging the slots, means for mounting work in theworkstandard comprising a pin having an intermediate journal portion, aplug mounted in one member and adjustably receiving one end of the pin,and means mounted in the other member and releasably retaining theopposite end of the pin, a motor, and an adjustable grinding wheelrotatable by the motor.

3. A radius grinding machine comprising a base, a Work-table mountedthereon for oscillatory movements in a horizontal plane, adjustablemeans limiting the extent of such oscillatory movements, a slideadjustable on the table in one direction and a second slide adjustableon the first-mentioned slide in a relatively right angular' direction,feed-control mechanism for adjusting the first-mentioned slide in saidone direction, a work-standard erected on the second slide andadjustable thereon, means for mounting Work on a horizontal axis in theWork-standard, a motor vertically adjustably mounted on the base, and agrinding wheel supported by and rotatable by the motor and mounted toturn on a vertically axis with its peripheral grinding surface spaced ahorizontal distance from vertical alignment with the oscillatory axis ofthe Work-table equal to the radius of the designed operation upon theWork.

4. A radius grinding machine comprising a base, a. Work-table mountedthereon for oscillatory movements in a horizontal plane, adjustablemeans limiting the extent of such oscillatory movements, a slideadjustable on the table in one direction and a second slide adjustableon the ilrst-mentioned slide in a relatively right angular direction,feed-control mechanism for adjusting the first-mentioned slide in saidone direction, a Work-standard erected on the second slide andadjustable thereon, means for mounting Work on a horizontal axis in thework-standard, a tooth support blade adjustably mounted on the secondslide, a motor post erected on the base, a motor vertically adjustablysupported by the post, and a grinding wheel supported by and rotatableby the motor and mounted to turn on a vertical axis with its peripheralgrinding surface spaced a horizontal distance from vertical alignmentwith the oscillatory axis of the work-table equal to the radius-of thedesigned operation upon the Work.

5. A radius grinding machine characterized as in claim 4 in which theWork-table is mounted on a sub-table casting for oscillatory movementsthereon, and the casting is releasably fastened to the base and thecasting and base are formed for adjustments of the former upon thelatter.

6. A machine tool comprising a base, a Worktable pivotally mounted onthe base and also adjustable thereon in a plane at right angles to theplane of the pivotal axis, a Work-holder mounted on the table andadjustable thereon in relatively right angular directions, meansproviding for the adjustment of the Work-holder for the accommodation ofwork of varying characters, a grinding wheel and means for rotating it,means for adjusting the grinding wheel in a direction parallel to thepivotal axis of the Work-table, and a support .blade mounted on thetable and angularly and rectilinearly adjustable relative to thework-standard.

LE ISLE D. NOBLE. ARTHUR H. STANTON, JR. JOHN G. JERGENS.

